I find the BLM buffs (specifically the potency increases) confusing. I know a few BLM who play their job really well and can keep up with others on single-target fights. Of course, there are fluctuations between jobs depending on the fight, but they are minimal if everyone knows how to maximize their potential. BLM were already the 'king' of AoE damage (yay flares) and nothing was done to adjust or balance this. They were just given more single-target potency.
The AoE damage of BLM needs nerfing, and i'm VERY surprised that it didn't get nerfed. An inventive nerf to it would be to nerf the recast time of Transpose, to prevent the constant flare rotations. But, it could have the side effect of lowing single target DPS slightly (if its too long due to getting a firestarter proc at the end of your fire phase and using transpose and then the proc to go back into fire; if that happens twice in a row, transpose may not be back up). It could also hurt lower lvl players.